There are some interesting differences between ancient prayer and modern prayer according to the LDS Bible Dictionary.
The attitude of prayer ordinarily was standing. (1 Sam. 1:26; Neh. 9:2, 4; Matt. 6:5; Luke 18:11, 13); also kneeling (1 Kgs. 8:54; Ezra 9:5; Dan 6:10); or prostrate (josh. 7:6; Neh. 8:6). The hands were spread forth to heaven (1 Kgs. 8:22; Ezra 9:5; Ps. 141:2; Isa. 1:15). Smiting on the breast and rending of the garments signified special sorrow (Ezra 9:5; Luke 18:13).
As missionaries, I remember teaching people to pray, but I never have done some of these ancient practices. Have any of you smote your breast in prayer? Have you prayed prostrate, or rent your garments?